Section Links

Our Providers

Some features may not work properly. Please try again or reload the page. If you continue to experience this problem please contact the system administrator.

Our Providers

Mark Bing, M.D.

As a board certified internist, Dr. Mark Bing specializes in the treatment of acute and chronic illnesses in adults and adolescents.

Dr. Bing received his Bachelor of Arts degree from Trinity University in San Antonio, Texas. He completed his medical education at University of San Carlos and completed his residency at Marshall University School of Medicine in Huntington, West Virginia. After his residency, he returned to Katy and began his practice in 1982.

Paul Bing, M.D.

Dr. Paul Bing specializes in Pulmonary disease and Internal Medicine.

Dr. Bing received his Bachelor of Science degree from the University of Texas at Austin and worked as a consulting engineer prior to entering medical school. He received his medical degree from Texas Tech University Health Science Center in Lubbock, Texas. He completed his internship and residency at the University of Kansas in Kansas City, and completed a Pulmonary and Critical Care fellowship at the University of Kansas. Dr. Bing and his family live in Katy.

Dr. Bing is a Diplomate in Pulmonary Disease and Internal Medicine as designated by the American Board of Internal Medicine.

Kelly McCullagh, M.D.

Dr. Kelly McCullagh specializes in Obstetrics and Gynecology. She is especially interested in adolescent gynecology and menopausal medicine. She is an advocate of patient education, allowing her patients to take an active role in their own healthcare.

Dr. McCullagh received her Bachelor of Arts degree from Texas A & M University and her Medical Degree from Texas Tech Health Science Center in Lubbock, Texas. She completed her internship and residency at the University of Kansas. Dr. McCullagh and her family live in Katy.

Dr. McCullagh is board certified by the American Board of Obstetrics and Gynecology.

William Currie, M.D.

Dr. Currie specializes in many areas of Gastroenterology and Internal Medicine. He is especially skilled in colonoscopy, polypectomy, variceal sclerotherapy, and percutaneous endoscopic gastrostomy.

Dr. Currie received his Bachelor of Science degree from Regiomontano in Monterrey, Mexico. He completed his medical education at the Universidad Autonomo de Nuevo Leon Facultad de Medicina also in Monterrey, Mexico. He completed his residency at Marshall University School of Medicine in Huntington, West Virginia. He was a fellow at Marshall University in the Department of Gastroenterology. Dr. Currie and his family live in Katy.

Dr. Currie is board certified in Internal Medicine.

Brenda Wainscott, M.D.

Dr. Wainscott specializes in the treatment of acute and chronic illnesses in adults throughout the greater West Houston area. Her compassionate nature and practical approach to medicine make her a natural fit for the care provided by Medical Colleagues of Texas.

She received her Bachelor of Science degree from Texas Tech University in Lubbock and completed her medical education and residency at the University of Texas Health Science Center in Houston. Dr. Wainscott and her husband live in Katy with their four children.

Dr. Wainscott is board certified in Internal Medicine.

J. Rick Adams , M.D.

Dr. Adams specializes in the treatment of adults and adolescents. He has expertise in the diagnosis and treatment of acute and chronic illnesses as well as preventive health measures.

Dr. Adams received his Bachelor of Arts degree from Baylor University in Waco, Texas. He completed medical school at the University of Texas Medical Branch in Galveston, Texas. He completed his residency in Internal Medicine at Michigan State University in Kalamazoo, Michigan. Dr. Adams and his family live in Katy.

Dr. Adams is board certified in Internal Medicine.

Tiffany Mullin , M.D.

Dr. Tiffany Mullin specializes in Obstetrics and Gynecology. She enjoys helping women deal with their health and life changes. She is a proponent of minimally invasive procedures including laparoscopic hysterectomy. Dr. Mullin also has experience with high-risk pregnancies.

Dr. Mullin received her Bachelor of Arts degree from Baylor University. She studied medicine at the University of Texas Health Science Center at Houston. She completed her internship and residency at the University of Texas Health Science Center. Dr. Mullin is a board certified obstetrician and gynecologist.

Andy Shen, M.D.

Dr. Andy Shen is able to treat the complete spectrum of acute and chronic illnesses in the adult and adolescent population. He is a strong advocate for preventive health measures and strives to keep patients healthy. Dr. Shen has a special interest in Sports Medicine and can treat a variety of problems relating to the muscles and joints as well as concussion management. He also helps care for many of the area high school sports teams.

Dr. Shen received his Bachelor of Science degree from The University of Texas at Austin. He received his medical degree from the American University of the Caribbean School of Medicine in St. Maarten and completed his Family Medicine residency training with Methodist Hospital at the Houston Medical Center. Dr. Shen finished his Sports Medicine fellowship with the Conroe Medical Education Foundation in Tomball, Texas.

Dr. Andy Shen is board certified in Family Medicine and Sports Medicine.

Bethany Peterson, M.D.

Dr. Bethany Peterson joined Medical Colleagues of Texas in December 2011. She has been practicing in the Katy area since 2008. She grew up in Katy where she graduated from Taylor High School. She then attended Brigham Young University and received a degree in Microbiology. After finishing medical school at Texas Tech University in 2004, she moved back to the Houston area where she completed her residency in Obstetrics and Gynecology at the University of Texas Medical School at Houston. She was voted outstanding Chief Resident in her final year. She enjoys all aspects of her field, including minimally invasive surgery and obstetrics. She lives in Katy with her husband and three daughters.

Cheng-huai Ruan, M.D.

Dr. Cheng-huai Ruan is a native Houstonian trained in Internal Medicine. He specializes in the diagnosis and treatment of a broad spectrum of chronic illnesses to emergent medical care of adults and adolescents.

Dr. Ruan was awarded the Bachelor of Science degree from Texas A&M University. He received his Medical Degree from Ross University School of Medicine where he spent his first year in Dominica, West Indies and the remainder of his clinical training years in New York, Florida, and Ohio. He completed his Internal Medicine residency in New York City at New York Hospital Queens: Weill-Cornell Medical College Program where he was awarded Teacher of the Year by his peers. He was subsequently elected Chief Resident of Internal Medicine and Academic Teaching Hospitalist Attending at New York Hospital Queens.

Dr. Ruan has cheerfully returned to Texas where he is board certified in internal medicine.

Jane Ellis, R.N.C., N.P.

Jane Ellis is an advanced nurse practicioner who is specialized in providing healthcare to women of all ages. Jane has practiced in the Katy area for over 15 years with a focus on health promotion and maintenance, and she has a great appreciation for women who are actively involved in their healthcare. Having lived in Katy for over 20 years, Jane has participated in numerous community activities including her church and the local schools.

Jane received her diploma from Texas Eastern School of Nursing in Tyler, Texas and has been a registered nurse for more than 25 years. She holds Bachelor and Master of Science degrees in nursing from the University of Texas School of Nursing in Houston.

Jane is certified as a nurse practitioner by the National Certification Corporation for Obstetrical, Gynecological and Neonatal Nursing Specialities.